Metal-bending machine.



L M. FEDDERS.

METAL BENDING MACHINE. AEPLICATION FILED MAY 2, 1913*.

4 SHEETS-SHEET l'.

l. M. FEDDERS.

METAL BENDING MAcHlNE.

APPLICATION FlLED MAY 2| 1913,

Patented Aug. 10,1915;

Lmma.

NIQ

' by @qua/z 5% ATTDRNEY;

J. M. FEDDERS.

METAL BENDING MACHINE.

APPLICATION man, MAY2,191a

M L z-Fh, D W W Mm )N N Mw... 4 l T m HN! A m n n M e\\, www lm, uw muhm* :l 0N F BQN m.\ i@ QN. x@ W QR @m N@ n@ R m l nu.. m .Eh 5 M ww .W wKm QMS www 5 1 l E b -Hwa wm \m 530m/ w Il k :H E uw m mb Q@ .mi M @L QBF. @L kN. m@ m l .m .mi .M W W w Cit JOHN' M. FEDIJERS, 0F BUFFALO, NEWYORK, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

FEDDERS MANUFACTURING COMPANY, INC., OE BUFFALO, NEW YORK, A CORPORA-TION F NEVI YORK.

Specification of Letters Patent.

METAL-ENDING MACHINE.

Application led May 2, 1913. Serial No. 764,978. l

. of laterally projecting plaits and also longitudinal offsets so thatthese strips may be used in the manufacture of Water cooling radiatorsfor automobiles.

In the accompanying drawings: Figure 1 is a perspective view of a metalbending machine embodying my improvements. Fig. 2 is a fragmentaryhorizontal section showing part of the mechanism for operating thelocking device for one section of the die. Figs. 3, 4, 5, 6 and 7 arefragmentary vertical longitudinal sections of the die and punch of thebending machine showing the parts of these'members in the differentpositions which they occupy during the operation of producing a radiatorstrip. Fig. 8

is a vertical transverse section taken in line 8 8, Fig. 3 and showingthe radiator strip disengagedfrom the die and punch. Fig. 9 is a bottomplan view of the punch. Fig. 1() is a top plan view of the die.- Figs.11 and 12 are fragmentary vertical longitudinal sections taken in thecorrespondingly numbered lines in Fig. 8. Fig. 13 is a perspective viewof a portion of the radiator 'strip which is produced by the metalbending machine of this invention. Fig.` 14 is a vertical sectionshowing the manner of assembling two of these radiator strips forproducing a plurality of air tubes.

Similar characters of .reference indicate corresponding partsthroughoutV the several' views.

Although my improved metal bending machine may be utilized for.producing strips of metal which have been bent into various forms themachine illustrated in the drawings is designed more particularly forproducing a radiator strip of sheet metal which in its finishedcondition comprises a succession of transverse webs 1 which are arrangedlengthwise side by side "in a longitudinal row, a pluralitv of laterallyprojecting plaits 2 the walls of which are connected at their outeredges while ltheir inner edges'are connected respectively with theopposmg'transverse edges of two'adjacent webs, outwardly projectingoffsets or beads 3 arranged longitudinally at opposite lateral edges o fthe webs and in a direction lengthwise of thestrip, and afplurality ofoutwardly projecting beads 4 each of which is arranged lengthwise on thecentral part of each web and forms a longitudinal groove or seat on theinner side of the respective web, as shown in Fig. 13. In the assembledcondition of two strips of this character each plait of one strip isarranged between two plaits of the other strip and engages its free edgewith the groove or seat on the web of the other strip between the twoplaits thereof, thereby forming a row of air tubes 5 between the twostrips, as shown in Fig. 14. The longitudinal beads on the outer sidesof the strips engage with corresponding beads on the strips of adjacentrows of air tubes, thereby forming intervening channels or conduitsbetween adjacent rows of air tubes as shownv in Fig. 14 through whichthe water liows and is cooled by the air passing through the tubes.

punch or upper member thereof which is movable vertically toward andlfrom the die isindicated as a whole by the numeral 7. The die ismounted on the stationaryholder, support or table 8 forming a part ofthe main frame of the machine while the punch is mounted on a verticallymovable head or holder 9 which is guided in any suitable manner on astandard 1() forming part of the main frame-and projecting upwardly fromthe rear part of the table. Although the punch may be operated by anysuitable means the same -is represented in the drawings as beingY raisedand lowered by means ofl a crank shaft l1 journaled horizontally andtransversely in the upper part of the standard and having its crankconnected by :means of a pitman or connecting rod 12 with the punchholder as shown in Fig. 1.

The die in its general organization jcomlil) prises a body having ahorizontal main base 13, a horizontal sub-base 14 resting upon the mainbase, a front cross bar 15 mounted on the frontfpart of the sub-base, arear cross bar preferably constructed of two sections 16, 17 which aremounted transversely on the rearpart of the sub-base, and twolongitudinal side bars 18 connecting corresponding ends of the front andrear bars so as to produce, in effect, a body having a rectangularsocket in its upper side. lVithin this socket of the body are arrangedthe main or workingsections of the die which comprise a front diesection 19 arranged immediately in rear of the front cross bar, and arear die section or holding section 20 arranged in rear of the front diesection andengaging its rear side with the frontv face of the frontsection 16 of the rear cross bar. The rear die section is capable onlyof vertical movement while the front' die section is capable only ofhorizontal movement toward and from the rear die section for the purposeof decreasing andV increasing the space between the opposing verticalfaces of these die-sections and -operating upon the strip of metal in amanner which will presently appear.

Normally the rear die section is yieldingly held in its elevatedposition in which the upper side of the same is above the level of thefront die section and the cross`bars of the die body. The preferredmeans for holding the rear die section in this positionas shown in thedrawings comprisey a supporting rod 21 secured with its upper end to theunderside of the mainfbase of the die body, a supporting disk 22 mountedon the lower end of this supporting rod, a lifting spring 23 engagingits lower end with the supporting disk, a lifting disk 24 engaging withthe upper end of the lifting spring, and two lifting rods 25 guidedvertically in ways formed in the main and sub-bases of the die body andengaging their lower ends with the upper side of the lifting disk whiletheir upper .ends engage with the underside of the rear die section. Theupward movement of the rear die section under the action y of thelifting spring 23 is limited by engagement of the lifting disk 24 withthe underside of the main base. The rear die section* is guided on thebody of the die by constructing its opposite ends of tapering orV-shaped form, as shown at 26 in Fig. 10, and 'engaging the same withcorrespondinglyshaped vertical grooves or ways in the adjacent partsl ofthe inner 'sides of the longitudinal'bars of the from being lifted outof theV die body by means of stop pins27 projecting laterallyfromM-,Opposite .ends thereof into vertical slots 28 formed in theadjacent portion of thebody side bars, as shown in Fig-8. On

die body., The rear die 'section is` further guided and also preventedits upper side the rear die section is pro-l vided in the central partthereof with a transverse rib 29 and near opposite ends thereof withlongitudinal'ribs 30.

Normally the front die section 1s yield-l adjacent part of therespective longitudinal bar, as shown in Fig. 10. Means are provided forholding the rear die section, when depressed, temporarily in thisposition and means are also provided for moving the front die sectiontoward the vrear die section while the latter is in its depressed p0-sition, said locking mechanism for the rearA die section andv the meansfor shifting the front die section rearwardly being preferably combinedand constructed as follows:

35 represents two locking openings formed lengthwise in the rear diesection and adapted when this section is in its lowered position to bearranged in line with corre. sponding locking openings 36,' 37 formed`respectively in thev front die sectionfand in the front section of therear cross bar of the body. l a

38 represents two horizontally and longitudinally movable locking pinsor rods which in their foremost position have their ings of the frontdie section, as'shown 1n rear end'sarranged within the guide openy Fig.3, but which in,their rearmostposition enter the locking open/ings onthe rear die section and/the reaecrossbar and hold the rear die sectionin its d epressed position, as shownrin Figs. 5y and Adjacent to itsfront end. each of the locking pins is provided w'ith a rearwardlyfacing shoulder y39 which is adapted to engage with the front` side ofthe front die section; In the foremost or retracted position of eachlocking pin its shoulder 39 is disengaged from the front side of thefront die section, as repre'- sented in'Figs. 3 and-1. After the lockingpin' during its rearward movement has passed through the respectivelocking opening of the rear die section .and has entered thel lockingopening 'o f the rear cross bar the shoulder 39 of the lockingpinengages 1 l with'the front side "of the' front die section, as shownin Fig. 5, so that during the last portion locking pin its shouldercauses the front die section tol be moved rearwardly toward therear diesection, as shown in Fig. 6.

The reciprocating movement ofthe two 12's of the rearward movement ofthel locking pins for locking and unlocking the a pin 44 depending rear diesection in its loweredl position and also moving the front die sectiontoward the rear die section and permitting the springs 33 to again movethe front die section into its forward position may be eiiected byvarious instrumentalities but preferably by the means which are shown inthe drawings and which are constructed as follows: represents alongitudinally movable slide which is guided in horizontal ways on thefront part of the main base of the die body and to the rear end of whichthe locking pins 38 are adjustably secured preferably by providing thefront ends of the locking pins with screw threads which engage withcorrespondingly threaded openings in the rear end of the longitudinalslide and lockingnuts 41 applied to the screw threaded portions of thelocking pins and engaging the rear end of the longitudinal slide. 42represents a horizontally and transversely movable slide guided in a.way formed on the Afront part vof the die base below. the longitudinalslide 40 andprovided with an'oblique slot 43 forming a cam whichreceives from the front end of the longitudinal slide.= 45 represents arotatable cam mounted on the adjacent end of the crank shaft of themachine and proj vided on its outer side with a cam groove 46. 47represents an upright rock lever pivoted on the standard of the machineand provided on its upper arm with a roller 48 which engages with thegroove of the rotatable cam while its lower arm is operatively connectedwith the transversely movable slide 42, as shown in Fig. l. During eachoperation of the machine the rotatable cam 47l moves the transverselymovable slide for-v ward and backward whereby the cam slot 43 causesthellongitudinal slide to make a forward and backward stroke, the movementsof these parts being so timed that they harmonize with the movements ofother parts of the machine with which they cooperate. The upper side orface of the .front die section is provided on its central part with atransverse rib 48 and adjacent to its opposite ends wit-hlongitudinal'ribs 49 which are-in line with the longitudinal ribs of therear die section.

Means are provided for ejecting or lifting the strip of sheet metal fromthe front and rear die sections after each stamping operation whichmeans are preferably constructed as follows: 5,0 represents two verticalejector pins arranged between the front and rear die sections and eachguided with its lower part in a guideway formed in the adjacent parts ofthe sub-base and the main base of the die body, as shown in F ig. 1l.Each of these ejector pins is yieldingly held inits elevated position inwhich its upper end is near the top of the die section by 'in F ig. 11,.In order to permit the front die section to approach the rear diesection without interfering with the ejector pins the opposing verticalfaces of these die sections are provided 'with recesses 53, 54 in linewith each ejector pin which provide the necessary clearance adjacent tothese pins and prevent the same from being pinched between the front andrear die sections as the front section moves toward the rear section.l

In its general organ1zat1on the punch comprises a body having abase 55which is secured to the vertically movable punch holder, a punch block56 secured to the underside of the punch base, a forming blade 57fixedly mounted on the central part of the punch block so as to projectdownwardly from the underside thereof vertically in line with the spacebetween the front and rear die sections, a front punch section 58arranged on the underside of the punch block vertically in line with thefront part of the face of the front die section, an intermediate punchsection 59 capable of vertical motion relatively to the punch block andarranged between the front punch section and the forming blade andvertically'in line with the rear part of the front die section, a rearpunch section or'holding section 60 movable'vertically relatively to theforming blade and the punchbody and arranged in rear of the formingblade and vertically in line with the rear diesection, and a gage blade61 mounted transversely on the rear yside of the rear punch sectionvertically in yparts ofthe longitudinal ribs fof the front die section.r.Phe main part df the face of the intermediate punch section isflat andadapted to coperate with the flat rear part of the face of the front diesection and near its opposite endsthe same is provided with longitudinalgroot/es 64 which ,are adapted to cooperate with the rear parts of thelongi.

tudinal ribs of the front die section. rI`he intermediate punch sectionis `gulded in a 66 and guided in a pocket-68 formed partly' in theadjacent part of the punch block and in the punch base and a spring 69arranged in the pocket 68 and bearing at its upper end'against thebottom of this pocket and at its other end against the head lof thisshifting pin, as shown in Fig. 12. The

downward movement of the intermediate punch section relatively to thefront punch section is limited by means of a downwardly facing shoulder70 formed Aon the intermediate punch section and engaging with anupwardly facing shoulder 71 on the` punch block, as shown in Figs. 3 and12.

The rear punch section or holding section is guided in a suitable way 72on thel underside of the punch block and is yieldingly held inadepressed position relatively thereto so that the .face thereof isbelow. the face of the front punch section and also be- -low the formingblade, this being preferably eected by means of two shifting pins 73guided in suitable openings in the upper cally in a pocket 75 formed inthe adjacent.

part of the punch block and each connected at its lower end with therear punch'section, a head v"ill secured to the upper end of each ofthese shifting rods and movable vertiupper part of the punch block andthe punch base and a Vspring 76 arranged in this pocket, and bearing atits lower end against the head 74 and a't its upper end against saidpocket. The downward movement of the rear punch section relatively 4tothe punch a clear space between the same and the die block is limited bythe heads the shifting pins 73 engaging with the lower ends ,of thepockets 7 5, as shown in Fig. 3. The underside or face of the rear punchsection is provided on its central part with atransverse groove 7 7which is adapted' to coperate with the transverse rib of the rear diesection and adjacent to its opposite ends 'the same is provided withlongitudinal grooves 7 8 which are adapted to cop'erate with thelongitudinal ribs ofthe rear die section.

Retaining means are provided for holding the sheet metal strip in placeon the rear die section preparatory to engaging the strip by the partsof the die' and punch which change the shape of the s ame. Theseretaining means preferably comprise two.

vertical retaining rods 79`each of which is arranged in correspondlngvertical openings formed inthe intermediate punch section while itsupper end engages with the upper end of said pocket. In the normalposition of each retaining p1n the same is moved downwardly relativelyto the intermediate punch section so that its lower end projects belowthe lower edge or face of this punch section, the downward movement ofthis pin in this direction being limited by the bearing head 80 at itsupper endengaging with the lower end of its companion pocket S1, asshown .in Fig. 3. p Y A Various means may be provided for s upplying thestrip of sheet metal from which the radiator section is made those shownin the drawings for this purpose being suitable and constructed asfollowsz'83 represents an arbor or spindle upon which a roll 84 of thesheet metal strip is mounted and which is journaled atits opposite endslin bearings 85 mounted on the main frame of the machine. From the roll84 the strip of metal passes forwardly between two feed rollers 86, 87,mounted insuitable bearings on the frame. One of these feed rollers,preferably the lower one is provided with a ratchet wheel 88 which isengaged by a feed pawl 89 mounted on a rocking feed lever 90 which ispivoted concentrically with vthe ratchet wheel. A rocking motion isimparted to the ratchet lever -by means of a connecting rod 91vconnected at its lower end with the free end of the rock lever whileits upper 'end is pivoted by means of a crank pin 92 to the outer sideof the rotatable cam on one side of the center of the crank shaft.This-strip feed mechanism is so timed that when the punch is elevated soas to provlde the strip of sheet metal is advanced one step after whichthe strip of metal is permitted to remain at rest until the same isoperated upon by the punch and die.

After each operation of the machine and while the punch is raised the'strip of metal is advanced one step and placed with the last formedplait against the rear side of the rear die section, the last formedtransverse -bead in engagement -with the rib of the rear die section,and the last formed longitudinal bead over 'the longitudinal r1bs of therear .die section, as shown by full lines in Fig. 3. At this time thelocking pins are in their foremost position,the front die section is in.its forward position, the rear die section is elevated, the intermediate-punchsection is projected below the front rear punch section projectsbelow the forming blade. The punch now descends and during the firstpart -of this movement the plungers 7 9 engageA first with the sheet andthen the gage blade engages with the previously formed plait, the rearpunch section engages with the top of the sheet metal blank so that thesame is gripped between this punch section and the rear die section andthe retaining rods 79 engage with the strip in frontof the rear diesection and are caused to' retract upwardly into thel punch, as shown bydotted lines in Fig. 3, therebyobtaining a firm grip upon the strip ofmetal for reliably holding the same in place preparatory to performingthe next stamping and bending operation on the same. During the nextportion or step of the downward movement of the punch, the forming bladeand the intermediate and front punch sections move downwardly while therear punch section and gage blade remain at rest,'this being due to thegreater strength of the main lifting spring. Q3 which holds the rear diesection in its elevated position as compared with4 the spring 76 whichtends to depress the' rear punch section. During this second downwardstep of the punch the forming blade bends the sheet metal stripIdownwardly along the front vertical side of the rear die section,thereby forming the rearwall of one of the plaits, as shown in Fig. 4.During the next portion or third step ofthe downward movement of thepunch the rear punch section moves downwardly Vin unison with the punchblock and forming blade by reason 'of the upper end ofthe rear punchsection being engaged by the upper end of its guideway, thereby causingthe rear die vsection to be depressed and the strip of sheet metal to bebent downwardly along the rearv side of the front die section forforming the front wall of the plait, as shown in Fig. 5. The stock forthus forming the front wall of the plait is supplied by the strip ofmetal moving forward at this time without restraint between the frontdie section and the front and intermediate punch sections so that nostretchiing of the metal occurs while forming a plait in the same.Immediately after the forming blades completes the plait the puncheffects the final step of its downward stroke whereby theintermediatepunch section recedes into the punch body but is pressedwith its face against the rear part of the front die section byengagement of the upper end of this die section with the upper end ofits guideway in the punch block, thereby forming the rear parts of thelongitudinal beads'and the front punch section engages with the frontpart of the front die section and forms the transverse bead on the stripand also the front portions of the longitudinal beads, as shown in Fig.

5. As the rear die section begins its downward movement the locking pinsalso begin their rearward movement and after the rear die sectioncompletes its downward movement the 4locking pins enter the lockingopenings of the rear die section and the locking openings of the rearcross bar, as shownvin Fig. 5, thereby locking the rear die section inits depressed position. During the first part of the subsequent risingmovement of the punch the forming blade is withdrawn from between thefront and rear die sections, the rear punch section and gage bladeremain in engagement with the .strip of metal and the locking pinscomplete their rearward stroke so that their shoulders engage with thefront side of the front die section and push the same rearwardly 'towardthe rear die section, whereby the partly formed plait is now completedby pressing the two walls of the same together, as shown in Fig. 6. Thepunch is now raised to its highest position and its parts assume theirnormal position to permit'the sheet of metal to be fed forward anotherstep either by hand or mechanical means as indicated in Fig. 7 and thenthe locking pins are moved forwardly so as to first permit the front diesection to recede from the rear die section and release its grip uponthe plait which has just been formed. 0

During the operation of forming the plait in the sheet of metal bybending the latterv downwardly between the front and rear die sectionsthe upper ends of the ejector pins are engaged and these pins aredepressed in opposite directions to the resilience of their springs butthe instant the front die section recedes from the rear die section theejector pins are quickly raised by their springs and 'engage the loweredge` of the plait which has been formed and lift the strip above thedie sections so that the strip is free to be fed forwardly another stepby the strip feed mechanism. The plaited part of the strip is Araised byits resilience above the die section of the press so as to be free topass forward between the die andpunch sections l when the latterareseparate but .if desired this may be aided by hand or mechanicalmeans. During the last part of the -forward movement of the locking pinsthe same are withdrawn from the rear die section and the latter israised into engagement with the underside of the strip by the spring 23.The machine lnow begins another series of operations for producing thenext following plaits and transverse and longitudinal beads in the stripof metal, the several steps above described being repeated for eachcycle ofy operations of the machine. f

In the operation of this machine the strip of sheet metal is alwaysunder perfect control, and the same is at no time free to becomedisplaced, thereby insuring absolute uniformity in bending and plaitingthe same, ,whereby when two finished strips of this'character areassembled they will fit each other accurately and permit of producingrows or tiers of radiator' tubes which are of uniform construction andpermit of producing a radiator which is regular and neat in appearance.

I claim as my invention:

1. A sheet metal bendingmachine comprising a die having a rear diesection which is movable vertically, a front die section which ismovable horizontally toward and from the rear section, a punch having ablade adapted to bend a part of the sheet metal between said front andrear die sections, and means for lockingsaid rear die sectiontemporarily in its depressed position comprisingva horizontally movablelocking pin movable in corresponding openings in said die sections. l

2. A sheet metal bending machine comf prising a die having a rear diesection which is movable vertically, a front die section which ismovable horizontally toward and from the rear section, al punch having ablade adapted 'to bend a part of the sheet metal between said front andrear die sections, and means for locking said rear die sectiontemporarily in its depressed position comprising a horizontally movablelocking lpin movable in corresponding openings in said die sections, alongitudinally movable slide carrying said locking pin and provided witha shifting pin, Va transversely movable slide having a cam slot whichreceives the shifting pin, a rotatable cam, and a rock lever having onearm-connected with said transversely movable slide while its other armis operated on by said cam.

3. A sheet metal bending machine comprising a die having a rear diesection which .ismovable* vertically, a front die section whichl ismovable horizontally toward and from the rear section, a punch having ablade adapted to bend a part of the sheet metal between said fron-t andrear die sec.

tions, means for locking said rear die section temporarlly 1n itsdepressed position and rec1procating said Afrontdie section comprising ahorizontally reciprocating locking pin' engaging with openings in saidfront and rear die sections and provided with a shoulder for engagingsaid front die section 'and moving the same toward the rear`die section.4. A sheet metal bendingmachine comprising a die having a rear diesection which is movable vertically, na front die section which ismovablehorizontally toward and from the rear section, a punch having ablade adapted to bend a part'of the sheet metal between said front andrear die sections, means orlocking said rear die section temporarilyin'its depressed position and reciprocating said front vdie vsectioncomprising a horizontally 4reciprocating locking pin engaging withopenings in said front and rear die sections and provided with ashoulder for engaging said front die section and moving the same towardthe rear die section, and a spring device for moving the front diesection away from the rear die section. y

5. A `sheet metal bending machine com prising a die having a fixed bodysection provided with a locking opening, a rear vertically' movable diesection having a locking opening, va front die section movablehorizontally toward and from the rear die sec tion and having a'lockingopening, a horizontally movable locking pin guided in the y plaitingblade adapted to move into and out of the space between the front andrear die sections.

6. A sheet metal bending machine comprising a die having a rearI diesection which is movable vertically, a frontdie section which is movablehorizontally toward and from the rear section, a punch having a bladeadapted to bend a part of the sheet metal between said front and reardie sections, means for locking said rear die section temporarily in itsdepressed position and a4 spring device for holding said rear diesection yieldingly in an elevated position when released.

7. A sheet metal bending machine comprising a die having a rear diesection which is movable vertically, a' front die section which ismovablehorizontally toward and from the rear section, a punch having ablade adapted to bend a part of the sheet metal between said front andrear die sections, means for locking saidrear die section temporarily inits depressed position, and a vertically movable ejector pin arrangedbetween said die sections.

8. A sheet metal 'bending machine comprising a die having` a rear diesection which is movable vertically, a front die section which ismovable horizontally toward and from the adapted to engage with saidrecesses of said,

die sections and to move the sheet metal blank upwardly out of the spacebetween said die sections.l f

9. A sheet metal bending `machine compris- 'ing a die having avertically movable rear section, and a vertically movable punch having abody section adapted to coperate with .the horizontally movable diesection, a blade fixed on the body of the punch and adapted to passbetween the front and rear die sections, and a holding-section mountedyieldingly on the body of the punch and adapted to coperate withthe'rear die Isection.

10. A sheet metal bending machine comprising a die having averticallymovable rear die section, and a horizontally movable` front section, anda vertically movable punch having a body section adapted to cooperatewith the horizontally movable die section, a blade fixed on the body ofthe punch and adapted to pass between the front and rear die sections, aholding section mounted yieldingly yon the body of the punch and adaptedto. coperate withv the rear die section and a holding section yieldinglymounted on the punchv body and adapted `to engage with the front diesection.

1l. Asheet metal bending machine comprising 'a die'having a verticallymovable rear die section, and-a horizontally movable. f front section,and al vertically movable punch having a body section adapted to c0-operate with the horizontally movable die section, a blade fixed on thebodyyof the punch and adapted to pass between the front and 4rear diesections, a holding section mounted yieldingly on the body of the punchand adapted to coperate with the rear die section, and a gage blademounted on said holding section and adapted to engage with a plait inthe sheet metal blank in rear of the rear die section.'

l2. A sheet metal bending machine comprising a die having a verticallymovable rear die section, and a horizontally movable front' section, anda vertically movable punch having a body section adapted to coperate iwith the horizontally movable die section, a y'45 blade ,fixed on thebody of the` punch and adapted to pass between the front and rear diesections, a holding section mounted yieldingly on the body of the punchand adapted to coperate with the rear die section, a holding sectionyieldingly mounted on the punch body and adapted to engage and agageblade section and adapt- With the front die section, mounted on saidholding ed to engage with a plait-in the sheet `metal blank in rea-r ofthe reardie section.

l13. A sheet metal bending machine comprising a die having a verticallymovable rear die section, and a horizontally movable .front section, anda verticallyl movable.

punch having a bodysection adapted to cooperate with the horizontallymovable die section, a blade iXed on the bodyv of the punch and adaptedto pass between the front and rear die sections, a holding sectionmounted yieldingly on the body of the punchand adapted to coperate withthe rear die section, a holding section yieldingly mounted on the punchbody and adapted to engage with the front die section, blade mounted onsaid holding section and adapted to engage with a plait inthe sheetmetal blank in rear of the rear die section, and a locking device fortemporarily holding the rear die se tion.

14. A sheet metal bending machine comprising a vertically movable reardie section, a horizontally movable front die section, means fortemporarily locking the rear die section in its depressed position andmoving the front die section toward the rear die section, a rear punchsection movable toward and from the rear die section, a gage blademovable with the rear punch section and past the rear side of the reardie section, a

4forming blade movable independently of said rear punch section andbetween said front and rear die section, an intermediate punch sectionmovable independently of said JOHN M. FEDDERS.

Witnesses: l l

Timo. L. PoPP, v Arnal;-l HEIGIS.

ction in its depressed posia gage i 'zo l

